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【单选题】
使用利尿药后期的降压机制是A.
排尿，降低血容量
B.
降低血浆肾素活性
C.
减少血管平滑肌细胞内 Na+，进而减少钠钙交换，减少了血管平滑肌细胞里的钙离子
D.
抑制醛固酮的分泌
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【简答题】设函数y=kx 2 +（2k+1）x+2（k为任意实数） （1）求证：不论k为何值，该函数图象都过点（0，2）和（-2，0）； （2）若该函数图象与x轴只有一个交点，求k的值．
【单选题】It was _____ he came bank from Africa that wear _________ he met the girl he would like to marry.
A.
when then
B.
not until
C.
not until that
D.
only when
【简答题】John was waiting for the girl whose heart he knew, but whose face he didn’t, the girl with the rose. Thir months ago, in a Florida library he took a book off the ___ 36 ___and found himself intere...
【单选题】如图甲所示的电路,当闭合开关S后,两个电压表指针偏转均如图乙所示,则电阻R1和R2两端的电压分别为 ( )
A.
8 V 2 V
B.
10 V 2 V
C.
2 V 8 V
D.
2 V 10 V
【简答题】设函数y=a x -b（a＞0，a≠1）的图象过点（1，2），函数y=log b （x+a）（b＞0，b≠1）的图象过点（0，2），则a+b等于______．
【单选题】It was ________ he came back from Africa that year ________ he met the girl he would like to marry. [ ]
A.
when; then
B.
not; until
C.
not until; that
D.
only; when
【简答题】阅读理解。 John was waiting for the girl whose heart he knew, but whose face he didn't, the girl with the rose. Thir months ago, in a Florida library he took a book off the shell and found himself inte...
【单选题】Was it from the lake ________ he often went fishing ________ he saved the drowning girl?
A.
that; that
B.
where; where
C.
where; that
D.
that; where
【单选题】He was so deep in love with that girl that he was willing to trade everything () her love.
A.
with
B.
to
C.
from
D.
for
【简答题】在如图所示的电路中,电阻R1=30Ω.开关S闭合后,两电流表的示数分别为0.3A和0.8A.求: (1)通电1min内,电流经过R1、R2时所做的功W1、W2. (2)通电1min内,整个电路消耗的电能.
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